Hyper-Casual Game Ideas

It's well known that hyper casual games, like the ones published by Ketchapp and made by Voodoo, are dominating the market.

For that reason, it's only logical that I, as a developer, try to make one of these games for myself. However, I'm having trouble coming up with good ideas! It seems like all the good ideas are gone and made, until another one comes out and I'm left thinking, "just why didn't I think of that?"